Tuskegee Airmen Memorial Highway, in honor of the Tuskegee Airmen, at the end of December 2014. In May 2017, MDOT raised the speed limit on I-75 between Bay City and Sault Ste. Marie, excluding the Mackinac Bridge, from . Gateway Project Beginning on February 25, 2008, I-75 closed completely to traffic in both directions from Rosa Parks Boulevard (exit 49) to Clark Street (exit 47) in Detroit. This facilitated the complete rebuilding of the road as part of the Ambassador Gateway Project to better connect I-75 and I-96 to the Ambassador Bridge. Through traffic on I-75 was rerouted along I-94 to I-275 and local detours were posted. The freeway reopened to traffic in June 2009, five months ahead of schedule. The overall project to realign and connect the bridge to the freeways was mired in lawsuits between MDOT and the private company that owns the bridge. The company's owner was jailed for contempt of court during court proceedings in early 2012. MDOT was later ordered to assume responsibility for construction, and the department completed the project on September 21, 2012. Freeway names I-75 has six named segments in Michigan. The southernmost section from the state line north to the Detroit area is the Detroit–Toledo Expressway. The segment through southern and central Detroit is known as the Fisher Freeway. It was dedicated on September 17, 1970, to the Fisher Brothers, who founded Fisher Body, later a part of General Motors. After the curve in downtown Detroit, I-75 follows the Walter P. Chrysler Freeway northward. That segment is named for Walter P. Chrysler, founder of Chrysler. The name was chosen by the Detroit Common Council on November 6, 1957, and codified in state law in 1990; the state definition for the name places the northern end of the designation at the Oakland–Genesee county line. Officially, the entire length of I-75 in Michigan is the American Legion Memorial Highway. As a practical matter, this name is not used on the southernmost segments of the Interstate. The American Legion was honored with the designation in 1969 in a state law that required private interests to finance the signage. Public Act 174 of 1984 redesignated I-75 in honor of the group and placed responsibility for signage in MDOT's hands. Another name that was applied to all of I-75 was the Michigan Bicentennial Freedom Way. Designated by Senate Concurrent Resolution 216 of 1975, the name only